import { utils } from 'xlsx/xlsx.js'//因为我这里光引入xlsx会识别不了，大家看情况导入

export function jsonToExcel(options = {}) {
  const { rows, name } = options
  const worksheet = utils.json_to_sheet(rows)
  console.log('worksheet', worksheet);
  /* 设置样式 */
  Object.keys(worksheet).forEach(key => {
    if (['A1', 'B1', 'C1'].includes(key)) {
      worksheet[key].s = {
        alignment: { horizontal: 'center' },
        font: {
          color: { rgb: 'FFFFFF' },
        },
        fill: {
          fgColor: { rgb: '4472C4' },
        },
      }
    }
  })
  // 设置宽度，只需要xlsx
  worksheet['!cols'] = [{ wpx: 100 }, { wpx: 400 }, { wpx: 100 }]
  const workbook = utils.book_new()
  utils.book_append_sheet(workbook, worksheet, 'Dates')
  downloadExcel(sheet2blob(worksheet), `${name}.xlsx`) // 下载
}
function sheet2blob(sheet, sheetName = 'sheet1') {
  const workbook = {
    SheetNames: [sheetName],
    Sheets: {},
  }
  workbook.Sheets[sheetName] = sheet // 生成excel的配置项

  const wopts = {
    bookType: 'xlsx', // 要生成的文件类型
    bookSST: false, // 是否生成Shared String Table，官方解释是，如果开启生成速度会下降，但在低版本IOS设备上有更好的兼容性
    type: 'binary',
  }
  const wbout = XLSX_STYLE.write(workbook, wopts)
  const blob = new Blob([s2ab(wbout)], {
    type: 'application/octet-stream',
  }) // 字符串转ArrayBuffer
  function s2ab(s) {
    const buf = new ArrayBuffer(s.length)
    const view = new Uint8Array(buf)
    for (let i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xff
    return buf
  }
  return blob
}

function downloadExcel(url, saveName) {
  let myUrl = url
  console.log('myUrl ', myUrl);
  if (typeof url === 'object' && url instanceof Blob) {
    myUrl = URL.createObjectURL(url) // 创建blob地址
  }
  const aLink = document.createElement('a')
  aLink.href = myUrl
  console.log('aLink.href ', myUrl);
  aLink.download = saveName || '' // HTML5新增的属性，指定保存文件名，可以不要后缀，注意，file:///模式下不会生效
  let event
  if (window.MouseEvent) event = new MouseEvent('click')
  else {
    event = document.createEvent('MouseEvents')
    event.initMouseEvent(
      'click',
      true,
      false,
      window,
      0,
      0,
      0,
      0,
      0,
      false,
      false,
      false,
      false,
      0,
      null
    )
  }
  aLink.dispatchEvent(event)
}

